Boring-bit.



J. B. LARNOE.

BORING BIT.

APPLIOATIQN IILED JUNE 14; 1912.

Witnesses Attorneys FATEN T OFFICE.

.J'OHN B. LARNCE, 0F BEAUMONT, TEXAS, \ASSIGNOR OF ONE-HALF T0 SpL. TOWNSEND AND AUBREY R. KEITH, OF BEAUMONT,

TEXAS.

BORING-BIT.

Specification of Letters'latent. "Patented J 1111610, 1913.

:Application filed June 14, 1912. Serial-No. 703,724.

' the periphery of the head, and to sweep the.

material transversely, in overlapped relation, thereby to fashion a cylindrical hole in the material, at the center of which hole a core is located.

The invention aims further'to provide novel means for connecting the constituent members of the head so as to provide novel means for assembling the head with a driving element.

With the foregoing and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter 'described and claimed, it being understood that changes in the precise embodiment of invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawings,-Figure 1 shows the invention in side elevation; and Fig. 2 is a bottom plan.

In carrying out the invention there is provided a head, comprising a post 1, which may be threaded exteriorly as indicated at 2 for connection with a drivingelement. The post 1 is connected at its lower end with a disk 3, which preferably is of circular contour and of equal thickness throughout its extent. Located below the disk 3 is a registering plate 4, of the same peripheral contour as the disk 3. The plate 4 is secured to the disk 3 through the instrumen tality of bolt and nut connections 5. Depending below the plate 4 and secured thereto in any desired manner are cutting bits which are denoted by the numerals 6, 7, 8, 9, 10 and 1 1. The bits 6 and 7 constitute one series of cutters, the bits 6 and 7 being located at the periphery of the plate 4. The bit 6 is equipped with an upright outting edge 12 which-projects beyond the periphery of the plate4,-and the bit 7 is provided with an upright cutting edge l4 which likewise is located beyond the periphcry of the head 4. Located between the 'pe riphery of the plate 4 and the-center of the platelare the b1tsy8 and 9, which constitute PEI, second series, the third series of bits; represented by the elements=l 0-'andl1, being located-inwardly of the bits 8 and 9.

.A'll of the several bits are. provided at their lower edges with cutting edges 15, disposed at right angles to the cutting edges 12 and 14 of the bits 6 and 7, respectively. The cutting edges 15 of the several series of bits, 6-7, 89, and 10--11 are so positioned that when the structure is rotated, these cutting edges 15 will sweep the bottom of the hole in overlapped relation, thereby forming a cylindrical opening in the material, at the center of which opening a core, represented by the material left between the bits 10 and 11, upstands. In practice it has been away readily.

As will be clearly understood, the upright edges 14 and 12 of the bits 7 and 6 respectively, serve to clear the periphery of the opening, and to prevent a binding'of the head, represented by the elements 3 and 4.

The device is of few parts and will serve to bore a hole with a minimum expenditure of the driving force.

Having thus described the invention .what is claimed is:-

1. In a boring drill, a post, adapted to be connected to a source of power, and having its lower end formed into a disk of uniform thickness; a corresponding registering plate of approximately the same thickness secured to said disk; nut and bolt connections securing the plate to said disk; said plate being provided with three series of cutting bits, one of said series having vertically disposed cutting edges which fall beyond the outer periphery of said plate; another 861108 of cutting bits falling within the path trav ersecl by the first mentioned bits, the third series of bits falling within the path traversed by said second mentioned bits, said bits being thus so arranged in relation to each other that the cutting edges of each series of bits will come into contact with a different part of the bottom of the hole being drilled, except at the immediate cen ter thereof.

2. In a boring drill, a post adapted to be connected to a source of power, and having its lower end formed into a disk of uniform thickness; a corresponding registering plate of approximately the same thickness secured to said disk; nut and bolt connections securing the plate to said disk; said plate being provided with cutting bits arranged in series, one series having vertically disposed cutting edges extended beyond the outer periphery of said plate, two other series arranged within the first mentioned series,

riphery; a post independent of the plate and provided at one end with a disk superposed upon the plate and projecting beyond the periphery of the post, the disk constituting a closure for one end of theopening; a securing device uniting the plate and the disk, and constituting the sole plate engaging element in the disk, the securing device being located between the periphery of the post and the periphery of the disk and being accessible from the top of the disk; and a bit abutting against the plate and located in the opening.

In testimony that I claim the foregoing as my own, I have hereto aflixed my signature in the presence of two witnesses.

his JOHN X B. LAlEtNCE.

mar

Witnesses i J. A. BELLAR, A. R. KEITH. 

